worth mentioning, this pump (used both on the crossfire and some Mercedes models) was produced with and without a seemingly unnecessary (unused) mounting boss. Unused that is until you go to install the needswings pulley saver kit.

In other words, if you have any plans of installing the needswings pulley saver kit in the future, make sure you get the version that has the (otherwise) unused (upper) mounting boss cast into it.

the first picture is the "without" style , the second is the "with" style
Chris